In which city is Greenwich located?

The correct answer is London. Greenwich is a historic town located in southeast London, England. It is globally renowned for being the home of the Greenwich Meridian (0° longitude) and Greenwich Mean Time (GMT), which serve as the international reference for time zones and geographical coordinates. Its historical significance in navigation and astronomy makes it a pivotal location.

• Options B, C, and D (Sydney, New York, and Delhi) are major global cities but are not where Greenwich is located. Greenwich is an integral part of London's cultural and scientific heritage.